As direct contact thermal energy storage technology has intensified the heat transfer effect in the heat accumulator, improved the heat storage and release rate by using the characteristic that heat transfer working medium contacts with heat storage material to form convective heat transfer, it has attracted extensive attention at home and abroad. This paper has summarized the development and current research situation of direct contact thermal energy storage technology from three aspects of heat storage materials, heat accumulators and application cases. In this paper, common materials of direct contact thermal energy storage technology are categorized into organic materials and inorganic materials. Then, this paper has compared thermophysical parameters and properties of the materials, discussed the key indicators influencing material properties such as undercooling, phase separation, low heat conductivity coefficient and thermostability. In terms of heat accumulator, this paper has summarized the melting and flow rules of materials in direct contact heat accumulator, summarized the heat transfer and optimization methods of direct contact heat accumulator, analyzed the current solutions to material deposition problem in direct contact heat accumulator, and proposed suggestions and measures. In the end, this paper has reviewed the application of direct contact thermal energy storage technology combined with demonstration projects or business cases, aimed at summarizing application experience, providing basis and support for further promotion of the technology.%直接接触式蓄热技术利用换热工质与蓄热材料接触并形成对流换热的特点, 强化了蓄热器内的换热效果, 提高了蓄放热速率, 在国内外受到了广泛关注.本文针对直接接触式蓄热技术, 从蓄热材料、蓄热器和应用案例三个方面对该技术的发展和研究现状进行了总结, 将直接接触式蓄热技术常见材料分为了有机类材料和无机类材料, 并对材料的热物性参数和性能进行了比较, 讨论了过冷、相分离、导热系数较低和热稳定性等影响材料性能的关键指标.在蓄热器方面, 总结了直接接触式蓄热器内材料熔化和流动规律、归纳了直接接触式蓄热器传热和优化方法, 针对目前解决直接接触式蓄热器材料沉积问题的措施进行了分析, 并给出了建议措施.最后, 结合示范工程或商业案例对直接接触式蓄热技术的应用情况进行了回顾, 旨在总结应用经验, 为该技术的进一步推广提供依据和支持.
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